• Journal of the Korean Society of Earth Science Education
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• v.13 no.1
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• pp.40-52
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• 2020

The purpose of this study is to explore ways to change high school earth science elective courses with the introduction of the high school credit system in 2025, and ways to restructure them in preparation for the next curriculum revision. For this purpose, Delphi surveys with earth science education experts, a survey with in-service earth science teachers, and in-depth interviews with experts were conducted. According to the results, we need to consider four keywords such as cultivation of earth science literacy, connection with student career paths, emphasis on the fun of earth science itself, and student selection rate and college entrance exam in restructuring Earth science electives. Based on this direction, we composed four subjects: Earth System Science emphasizing earth science literacy, and three such subjects reinforcing career connection as Solid Earth Science, Atmospheric and Ocean Science, and Space Science. To resolve concerns about falling selection rate of earth science courses with the introduction of the high school credit system, it is necessary to re-establish the status of the earth science subjects including enhancing the career connection of the earth science electives. Follow-up studies are necessary to elaborate and publicize the titles and core concepts of Earth science electives.

• Journal of the Daesoon Academy of Sciences
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• v.37
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• pp.141-190
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• 2021

In early modern Korea, the founders of three main-stream indigenous new religions, Choi Je-woo (崔濟愚), Kang Il-sun (姜一淳), and Park Jungbin (朴重彬), were all ruined yangban, who could no longer maintain the social dignity of yangban. Prior to their regular religious activities, they earned livings as rural teachers, peasants, merchants, and fortune-tellers. They were marginalized for having declined from upper-class nobles to lower-class people. Due to their subalternal status, they religiously represented the inexpressible aspirations and resentments held by various subalterns. The millennial movements of marginal religions in the late Joseon Dynasty exposed and deviated from the fetters of the established order, but they did not propose a new alternative order to replace it. Unlike these millennial movements, Choi Je-woo, Kang Il-sun, and Park Jungbin all proposed utopian visions of post-subalternal alternative religions that systematically presented and practiced new alternative worldviews characterized by the "Great Opening of the Later World (後天開闢)." The world they longed for was one wherein anti-subalternal social regulation were overthrown, the oppression of various subalterns end, and the established social order was replaced. In this article, I have argued that three main-stream indigenous Korean new religions, Donghak (Eastern Learning), the Jeungsan-inspired religious movements, and Wonbulgyo (Won Buddhism) are utopian alternative religions. I made this argument by analyzing some aspects by which they represented subalterns and offered subalterns a new religio-social status.

• The Journal of the Acoustical Society of Korea
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• v.33 no.3
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• pp.184-190
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• 2014

Although it is ideal that the sound with the range of 20 ~ 20,000 Hz is produced by the loudspeaker system composing of only one loudspeaker unit, it is almost impossible now. Therefore, the audible frequency range is now produced by the loudspeaker system, which is consisted of more than two loudspeaker units. The multi-way loudspeaker system certainly requires a crossover filter, which is divided the audible frequency into low and high frequency ranges. The crossover frequency of filter usually is in the range of 1 ~ 4 kHz, the frequency range can largely affect to the sound articulation and quality. It is an example that the phase and amplitude at the crossover frequency can be different from each other, due to the variously reasons. Conversely, they can not produce the smooth frequency response due to the different distance between the two loudspeaker units and electrical properties. As a result, the sound articulation and quality can be degraded. Therefore, the phase and amplitude response at the crossover frequency has to be deeply considered, in order to exactly match the woofer and tweeter. In this study, it is proposed the methods which are the flat frequency and phase response to be obtained by adjusting of the delay time between loudspeaker units, and the choice of filter to be considered the roll-off properties of each unit. It is achieved the frequency response with ${\pm}1$ dB, and the sound articulation is also improved.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.5
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• pp.48-59
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• 2019

In recent years, the type of bridge where cables such as suspension bridge and cable-stayed bridge are the main factors in the construction of long-range bridges has been soaring. The effects of cables on these structures are very large, and for structural analysis, it is necessary to study the cable and the structural changes according to the mode characteristics of the cables. In particular, cables are directly connected to camber adjustment, which conveys load effects on girders to tower, and are important components in the overall structure, and since the initial tension on the construction is compared with the tension over time, this study was conducted to help identify the condition of the bridge's aging and abnormalities. Therefore, in this study, the characteristics of the mode from the mode analysis through the impact hammer to the mass of the cable and the change in the length of the cable are analyzed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.12
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• pp.2963-2967
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• 2015

The pump-probe scheme is used to analyze the cross-phase modulation penalty of a single-mode fiber in a WDM system. The pump signal is assumed to be a periodically modulated input like a raised sinusoidal. The periodic signal models an alternating bit sequence, and leads to an analytical expression of CPM penalty which is measured by EOP. The derived expression shows good agreement with numerical results in conventional single-mode fiber systems over a wide range of channel spacing, ${\Delta}f$. In dispersion-shifted fiber systems when ${\Delta}f$ < 100GHz, the derived expression shows increased discrepancy with the numerical results due to the increased FWM. This is not a surprising because the pump-probe scheme is used to analyze system performance degradation due to CPM.

• The Journal of the Korea Contents Association
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• v.10 no.9
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• pp.276-284
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• 2010

The purpose of this study was to investigate satisfacation level of clinical practice and related variables to develop more effective learning program for students in the department of radiology. We surveyed 138 students who participated in the clinical practice program and they were university or college students in the area of Busan and Kyungnam. As a result, the satisfaction level of professional guidance were the highest and the satisfaction level of practice evaluation were the lowest. In the college students, the satisfaction level of the professional guidance were the highest and the satisfaction level of practice environment were the lowest. In the university students, the satisfaction level of the practice duration were the highest and the satisfaction level of practice evaluation were the lowest. The results of multiple regression analysis between the satisfaction level and the related variables indicated that the status of radiologist in the clinical practice are the major component in the college students and the status of radiologist in the academic duration and the clinical experience are the major component that contribute the satisfaction level in the university students.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.7
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• pp.955-961
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• 2021

In modern warfare, the importance of electronic warfare, which carries out a mission that using radio wave to find out enemy information or to protect ally information, has increased. Radar jamming technique is one of the most representative techniques of EA(Electronic Attack), it disturbs and deceives enemy radar system in order to secure ally location information. Velocity deception jamming technique, which is one of the radar jamming techniques, generally operate against pulse-doppler radar which use doppler effect in order to track target's velocity and location. Velocity Deception Jamming Technique can be implemented using DRFM(Digital Radio Frequency Memory) that performs Frequency Modulation. In this paper, I describe implementation method of VGPO/VGPI(Velocity Gate Pull-Off/Pull-In) velocity deception jamming technique using phase-sampled DRFM, and verify the operation of VGPO/VGPI velocity deception jamming technique with board test under signal injection condition.

• Communications of Mathematical Education
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• v.36 no.4
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• pp.469-486
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• 2022

Counting occupies a fundamental and important position in mathematical learning due to its relation to number concepts and numeral operations. In particular, counting up to large numbers is an essential learning element in that it is structural counting that includes the understanding of place values as well as the one-to-one correspondence and cardinal principles required by counting when introducing number concepts in the early stages of number learning. This study aims to derive didactical implications by investigating the possibility of and the strategies for counting large numbers that is expected to have no students' experience because it is not composed of current textbook activities. To do this, 89 second-grade elementary school students who learned the three-digit numbers and experienced group-counting and skip-counting as textbook activities were provided with questions asking how many penguins were in a picture where 260 penguins were irregularly arranged and how to count. As a result of analyzing students' responses in terms of the correct answer rate, the strategy used, and their cognitive characteristics, the incorrect answer rate was very high, and the use of decimal principles, group-counting, counting by one, and partial sum strategies were confirmed. Based on these analysis results, several didactical implications were derived, including the need to include counting up to large numbers as textbook activities.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.7 no.1
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• pp.743-752
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• 2017

This paper analysis the creative convergent person and the analysis of educational purpose system based competence in the 2015 revised curriculum. For this end, first, It discuss the educational purposes of the elementary and secondary school. The educational purposes are specified in the law, the general guideline and subject matters of the national curriculum. Second, It find out the relationship between creative convergence person and educational purposes. The core competencies that emerged from 2015 revised curriculum are an important role for the realization of creative convergence person. Finally, each purpose for the promotion of creative convergence person review how adequately defined. The review divided the three; the stipulation of legislation, general guideline of the national curriculum, subject matters of the national curriculum. As a result, the purpose of the direct role for the realization of creative convergence person is core competence and special competency of a subject matters. These competencies are reflected in achievement standards of the contents system in subject matters of 2015 revised curriculum. The core competence is a kind of educational purposes in terms of learners.

• The Journal of the Convergence on Culture Technology
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• v.10 no.1
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• pp.297-305
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• 2024

As society changes rapidly, the role and status of general education has produced many changes, and accordingly, it is forming a close relationship with various social and cultural environments around the school. Especially, the direction in which general education should proceed and the development of regional-linked general education models have been actively studied at a time when the relationship between local regions and universities is getting strong. In this study, we have provided significant policy implications related to the development and application of future university-local cooperation models by developing a subject of community service activities based learning (CSAL) to get closer to community service and by analyzing actual educational cases and applying them to real community service organizations. In addition, we closely collaborated with local volunteer organizations operated by this local government system to connect with local community service, and through this, we reviewed actual cooperative classes with a local university and local volunteer organizations for the class curriculum, and developed a model to activate the university-local educational ecosystem.